Mold



H. BARKSCHAT.

MOLD.

APPLICATION FILED JUNEao. 1919.

l 3 98,412 Patented Nov.I 29,1921.

H. BARKSCHAT.

MOLD.

APPLICATION FILED JUNE 30, i919.

L 3 @A l 2., Patented Nov. 299 192i..

2 SHEETSnSHIiE]I 2.

$15 t as indicated by line 7-7 on Fig. 5; Fig. 8

UNITED STAT-Es PiviisN'rA OFFICE.

HENRY 'BARKSCHAL OF LOS ANGELES, CALIFORNIA.

MOLD.

Application led June 30,

To all whom t may concern:

Be it known that I, HENRY BARKsoHAT, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have invented new and useful Improvements in Molds, of which the following is a specification.

This invention relates to molds and particularly to molds for making, casting, and forming reinforced concrete posts or other elongated objects of a plastic nature; and

' relates'more particularly, in its specific as- .following detailed description of a pects, to molds adapted for use in the centrifugal process of forming concrete posts and the like. It is a general object of the invention to provide a mold construction strong and durable in its nature, as inexpensiveas possible in construction; to provide which Figurel is a longitudinal central section of the mold, showing it assembled and showing the concrete reinforcements in place ready to receive acharge of concrete; Fig. 2 is an enlarged cross-section taken on line 2--2 of Fig. 1; Fig. 3 is an enlarged crosssection taken on line 3-3 of Fig. l.; Fig. 4 isan enlarged cross section taken on line 4 4 of Fig. 1; Fig.` 5 is a detail section taken on line 5-5 of Fig. 1; Fig. 6 is a fragmentary elevation taken as indicated by line 6-6 on Fig. 1; Fig. 7 is a detail view taken is an enlarged detail, part section and part elevation, taken as indicated by line 8-8 on Fig. 3; Fig. 9 is an enlarged detail taken as indicated by line ,9e-9 on Fig. 1; Fig. 10 is an exterior elevation of the mold; and Fig. 11 is an enlarged section on line 11-11 of Figi l.

- Although I illustrate this mold in a spe- -ciic form adapted to the formation of a reinforcedconcrete post or the like, it will'be Specification of Letters Patent.

Patented Nov. 29, 1921. 19.19. serial No. 357,571.

readily understood that the invention is not llimited to this particular and specific use, butwmay be put to any other use, such as for casting pipe, or in general for casting any 'elongated object, or any object wherein a mol of the character described may be conveniently used.

For the specific purpose of casting` concrete columns, the mold is made with a central barrel-or body A, a base box B, and a capital box C.'

The body of the mold is made up of a plurality of easing staves 10 and a pluralityv of mold staves 11 and 12 within the casing staves. The mold staves in this. particular case comprise finte' staves 12 and spacer staves 11; but the specific formation of the mold staves will of course depend upon the configuration desired to give the exterior of the concrete casting. The casing staves may be secured to each other by wood screws as is indicated at 13; and the mold staves may be secured to the interior surface of the cas! ing by means of screws as is indicatedI at 14. The composite casing and mold which is Vthus built up is preferably made in three or more separable sections which part on the line 15, 15, as shown in Fig. 3. These parting lines or surfaces each have an offset portion as shown at 15a; and in one of the separable parts the offsets are made in opposite directions so that' one of the separable parts may be removed directly outwardly without interference from the offset portion. For instance, in Fig. 3 of the drawings the uppermost separable part is shown with such offsets so as to be removable from the other two parts by movement directly upwardly, in the direction indicated by the arrow in that figure. The offsetting of these parting surfaces aids in the accurate registration Vof the separable parts of the mold and insures anaccurately alined interior mold surface. lt will be noted that the offset surfaces are side surfaces of the mold staves; they being so spaced and arranged that the offset parting surfaces will come at the joints between them, while the main parting surfaces 15 come at joints between the casing staves 10. f

For the purpose of reinforcing the separa-L ble parts whlch have been described, and also for the purpose of providing means for holding the separable parts-together, l provide a plurality of reinforcing and encircling segments, which are in the nature of outstanding flanges 21 and with side flanges 22; and wood screws 23 are passed through the flanges 22 and screwed` into the@v casing staves 10 to secure the encircling segments 20 throughout their lengthspto the casing staves. These encircling segments are placed upon the casing at suitable longitudinal intervals. Each separable part of thev mold body is thus made strong and rigid and is reinforced against distortion, .disintegra-- tion, or breakage; and all of this is done without the necessity of providing an entire metal casing for the 'separable parts as has heretofore been usually the case. Such entire metal casings have usually been heavy and bulky, whereas my improved mold construction is now of lightweight, and is correspondingly easy to handle; and is inexpensive to make and assemble. The encircling segments are" preferably made byttaking two angle bars and bending them to the proper curvature and then bolting oeting theml on opposite sides of-spaeer blocks 20a. These encircling segments further provide the means for securely and tightly clamping the separable parts of the moldtogether in the assembled forination shown in the drawing.

`At one end of each of these encircling segments there is pivoted at 25 a draw bar 26 which is preferably provided wlth a plurality of aperturesy 27 in its end which pro@ jects beyondwthe end of the encircling segment; and this projecting end is adapted to ass between the anges 21 of the adjacent end) of the adjacent encircling segment.1 In the` flanges 21 of this adjacent encircling segment there are apertures 223i which register withapertures 27 so that adrift 4in 29 may be driven through the registere apertures. These apertures may so register with `each other that vif the driving of one drift p'in into one set of apertures does Anot draw the -parts sufficiently close together, then another drift pin maybe driven into another set of apertures to draw the parts more closely together, and the firstY driven drift pin, when loosened, may be removed.

The metallic segments 20 are made of such lengths that their ends are not brought together by the` clamping' action; so that all of the clamping compressing stress is trans-4 mitted directly'to the opposing parting surfaces of the wooden mold to vmake tightly closed joints between the separable parts.

The capital box C is constructed ,very much inthe same manner as is the body except that it has a metal cylindrical outer casing or shell 40 made in separable parts corresponding 'with the se arable parts of the -casing staves and mo d` staves of the whole mold. These shell parts; 40 arel secured `to the casing staves l0 o'f the capital box by means ofv screws 23; and certain lower end portions of the shell parts 40 -10a "and v12a are secured to the casing staves 10. of the mold body by means of wood screws 41', The casing staves 10 and mold members 12a-varesecured together by screws 70 13a and 14a in the manner hereinbefore described. 'The' mold members 12 may be narrowstaves, or may be broaderand in the form of segments as I illustrate and describe in the Aconstruction of the base `box B. The separable parts of' the capital box' are secured together by a means which is best shown in Figs. 2 and 9; comprising fbolt lugs 42l on the edges of the' shell parts 40, bolts- 43 passing through these lugsu' and 80 wedges or drift pins 44 passing through the bolts. The top plate 45 is secured to the capital box shell in much the same manner, by bolts 46 which pass through lugs 47 on shell 40 and pass also through the plates 45, 85 and by wedges 48 which pass the bolt above the plate 45.

.i The basejbox B also has an exterior shell 1f The members12b are here segments rather than narrow staves, and may be secured to staves 10b by screws 14"; staves 1()b being secured together by screws 13b. The casing 95 staves 10b are made long enough so that their upper ends overlap the lower .ends of casing staves 10; so that a joint of some considerable length is made between the staves 10 and the staves 10b. The upper ends ctl00 the' casing parts 50 are provided with a ribbed contracted portion 51 which bears 'directly upon the outersurface of the casing staves 10; being secured thereto by suitablel screws as shown at 52. At52`a screws are 105 used to secure vand hold togethe-i` the lower ends'of staves 10 and the upper parts of staves 1 0. The shell 50 is secured to staves 10a by screws 23a. A strong connection is thus made 'between the parts of 'the base 1,10 box and the partsof the main. body of the moldT-a joint which will not break or open when 'the separable parts of the mold are handled. A

The base box of the mold is, provided with suitable means for forminga hollow` interior. For instance,"I provide a core block 60 which is preferably faced with metal, as shown at 60, and is provided for the purpose o f forming a hollow in the base. 120 A side openingimay be formed Iin the baseby the use of a core block 61 which is held in place by a bolt 62 which extends to the outer surface of the base box and has a nut 63; the nut being removed, and the core block 61 125 being left in the surrounding concrete (shown at 64 in- Fig. 5) when the mold part is removed. This core block 61 is removed interiorly into the core opening made bythe core block 60 after the core block 60 has 130A.'

been removed. The core block 60 is secured to the bottom plate 65 of' the mold, which bottom plate 65 is secured to base shell 50 in the same ,manner in which top plate 45 isvsecured to capital shell 40. The parts of the `base shell are also secured together by the same means as before described by which the parts of the capital shell are secured togeth'er. In 'order to form a depression around the outer end of the opening formed by core block 61, I fasten a small print plate 70 to the inner mold lface of the base box. The core block 61 seats back on this plate 70. At the four corners of plate 70 I pass bolts 71 through from the exterior of the base box to the inner face of plate 70, these bolts being screwed into anchor' lugs 72, which anchor lugs project beyond the inner face of plate 70, and are cast into the concrete when it is formed. Previous to the removal of the mold from the concrete, the bolts 71 are unscrewed from anchor lugs 7 2 and the anchor lugs are thus left in the formediconcrete ready to receive the screws or bolts by which a cover plate vis fastened in the depression made by plate 70, to cover the opening made by core block 6l. Core block AG11-plate 70, and the accompanying bolts, are situated on a center radial line of one of the separable parts of themold (see Fig. 4) so that the mold part may be moved off the plate, bolts, etc.

In Fig. 1 I show the reinforcing elements 80 in positi n longitudinally .of the mold.

These eleme ts A80 are joined laterally by suitable wire connections 81; and the upper ends of elements 80 project through top plate 45 and are there secured by nuts 82 screw-threaded upon the upper ends of the rods 80. The lower ends of these rods 80 are secured to anchors or foot brackets 83 whose lower ends extend out horizontally through the wall of the mold, being held in inverted channel shaped boxes 84 which pass f through apertures 85 in the lower ends of j the base box directly above the base plate:

65. Foot brackets 83 rest directly upon the base plate 65 and screws 86 pass through plate 65 and seat 83 and screw into the boxes 84 to hold all of the parts in place. When the mold igs disassembled and taken off the completed :concerte post, these screws 86 are removed and the 'boxes 84 removed outwardly so that there is suilicient free space around brackets 83 to enable the mold parts vto be removed Without interference.

Having described a preferred form of my invention, I claim: 1'

1. A mold comprising a plurality of separable ,'sections', each including longitudinally extending Wooden members and segmental metal members` extending' transversely of and secured to the wooden members, the ends of the metal members on adjacent sections being in alinement when and means for retaining the sections are assembled to form the-mold,

the sections in assembled relation includlng draw bars each pivotally connectedat one end to one of the metal members 'and having its other end overlapping and detachably connected to the alined metal member of the adjacent section. l

' 2.b A mold comprising a plurality of separable sections each including a series of .longitudinally extending members and a plurality of segmental members, of channel form in cross section, extending transversely Y o'f and secured to the longitudinal members, the ends of each of the segmental members of each section being in alinement with the ends of corresponding members of adjacent sections when the parts are assembled to vform the mold, and meansA for retaining the sections in assembled relation includingA draw bars each pivotally mounted within the channel of one of the lsegmental members and having one end extending into the channel of the alined member on an adjacent section and detachably connected to the last said section.

`3. In a imold, the combination of a plurality of separable Wooden parts, each in segmental form, metallic reinforcing and binding segments secured to and encircling the outside of said separable Wooden parts, said metallic segments being secured throughout their lengths to the wooden parts and comprising substantially channel shaped members with radially outstanding flanges, a draw bar pivoted to one-end of each of the segments between its flanges and projecting a free end beyond the segment and having apertures through that end, the free end adapted to extend between the'flanges of an adjacent Vsegment which have apertures adapted to register with the draw bar apertures, and drift pins adapted to be driven -through the registered apertures to draw the segments and the separable parts together.

4. In a substantially cylindrical mold having two parts 'adjoining end to end and one larger lthan the other, casing members for the larger part extending over the walls of the smaller part, and a metallic shell for the larger part outside its casing, said metallic shell extending over the part of the casing members which ,overlap the smaller mold part and having a reduced portion beyond the end of the casingmembers which reduced portion bears on and is secured to the wall of the smaller mold part.

5.'In a separable mold of substantially cylindrical form and having two; portions of different size adjoining end to end, the mold being formed in separable segments parting on longitudinal planes, the walls of each portion of each segment being of Wood; the Wall of the larger portion overvlapping the end of the wall of the smaller portion, and a metallic casing for the larger portion extending completely over its wall and having an inwardly offset reduced portion resting on and secured to the wall of the smaller portion, substantially as' described. Y t l i 6. In a mold substantially cylindrical and having two portions of diierent size adjoining end to end, the mold being Yformed in parts separable on longitudinal planes; wooden walls for the two portions of the mold, metallic reinforcing and binding segments encompassing the walls of the smaller portion and secured 'to 'the outer surfaces of those walls, means at the ends of the segments adapted 'to drawA the segments and the separable parts together, the walls of the larger portins voverlapping the walls of the smaller portion, metallic shell segments secured to the outside of the larger portion walls, means tov draw said shell segments together, and said shell segments having inwardly offset reduced portions at the ends of the larger portionl walls, which reduced portions bear on and are secured to the walls of the smaller portion, substantially as described.

7. ln a circular mold, 'thecornbination of neen-ria aplurality of separable parts with irregular inner molding faces, the several parts meeting on radial surfaces in oiiset planes presenting shoulders to prevent relative movement between the several parts.

.8. In a circular mold, the combination of a plurality of separable parts, the several parts meeting on radial surfaces ineoifset planes presenting shoulders toprevent relative movement between the several parts; reinforcing and binding segments ysecured to and encircling the outside of said separable parts, and securing means ada ted to draw and hold the segments toget er.

9. .ln a circular mold, the combination of a plurality of separable mold'parts each embodying an outer course of staves and an inner course of mold-surface-forming staves, the two sets of staves being so placed with relation to each other as to form for each mold part a shouldered edge surface complementary to a similar surface of another mold part. A

ln witness that I claim theV foregoing l have hereunto subscribed my name this 19th day of June,-1919.

HENRY BARKSCHAT. lVitness:

VIRGINIA I. Beernem. 

